Designed and manufactured in accordance with API spec 8A, being authorized t use the official API monogram. Sheave grooves are intermediate-frequency quenching-treated, which leads to better surface hardnesss and longer service life of drilling line.
Sheaves are all equiped with double-tapered rollelr bearinfs, each beaaring contains unique oil way.
with high-strenth drilling line elevator bails.
sheaves and bearing of traveling block are interchangeable for mated crown block.
